Trailer coupler



FIG. 1 is a perspective view of a trailer coupler showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines showing the mounting portion of the trailer coupler in FIGS. 1, 2, 3, 6 and 7 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for: trailer coupler, as shown and described. 